"Creating new people, by having babies, is so much a part of human life that it is rarely thought even to require a justification. Indeed, most people do not even think about whether they should or should not make a baby. They just make one. In other words, procreation is usually the consequence of sex rather than the result of a decision to bring people into existence. Those who do indeed decide to have a child might do so for any number of reasons, but among these reasons cannot be the interests of the potential child. One can never have a child for the child's sake."
— Better Never to Have Been: The Harm of Coming into Existence by David Benatar
There are various reasons why antinatalists believe human reproduction is problematic. The most common arguments for antinatalism include that life entails inevitable suffering, death is inevitable, and humans are born without their consent (that is to say, they cannot choose whether or not they come into existence). Additionally, although some people may turn out to be happy, this is not guaranteed, so to procreate is to gamble with another person's suffering. There is also an axiological asymmetry between good and bad things in life, such that coming into existence is always a harm, which is known as Benatar's asymmetry argument.